A321230 Number of set partitions of [n^2] into n n-element subsets having the same sum.

1, 1, 1, 2, 392, 3245664, 6534071578530

Offset

0,4

Links

Table of n, a(n) for n=0..6.

Wikipedia, Partition of a set

Formula

a(n) = A203986(n,n).

Example

a(0) = 1: empty.
a(1) = 1: 1.
a(2) = 1: 14|23.
a(3) = 2: 168|249|357, 159|267|348.

Crossrefs

Main diagonal of A203986.

Cf. A006003, A037270, A052456, A104185, A321282.

Sequence in context: A343698 A176937 A092701 * A281322 A360702 A249359

Adjacent sequences: A321227 A321228 A321229 * A321231 A321232 A321233

Keyword

nonn,more

Author

Alois P. Heinz, Oct 31 2018

Status

approved